Preheat your oven to 300°F (150°C).
In a large Dutch oven, heat the olive oil over medium-high heat. Season the chuck roast with salt, pepper, garlic powder, onion powder, thyme, and rosemary. Sear the roast on all sides until browned, about 4-5 minutes per side.
Remove the roast from the pot and set aside. In the same pot, add the chopped onion and minced garlic, sautéing until the onion is translucent, about 3-4 minutes.
Return the roast to the pot and pour in the beef broth and Worcestershire sauce. Add the carrots and potatoes around the roast. Bring to a simmer.
Cover the pot and transfer it to the preheated oven. Cook for 3 to 4 hours, or until the meat is tender and easily shreds with a fork.
Once cooked, remove the roast and vegetables from the pot and set aside.
To make the blue cheese gravy, combine the cornstarch and water in a small bowl to create a slurry. Bring the remaining liquid in the pot to a simmer over medium heat, then whisk in the slurry. Cook until thickened, about 2-3 minutes. Stir in the crumbled blue cheese until melted and smooth.
Serve the pot roast and vegetables with the blue cheese gravy drizzled on top.